SPD Bleed/drainage screw SPD Bleed/Drain Screw easily bleeds/drains desired system. With its innovative design in black anodization and NBR O-ring solution, this air screw is both easy to use and has a wide range of applications. The screw is designed to be used as an air screw for cooling systems or, for example, draining an oil catch tank. With this O-ring solution, this screw does not need to be tightened hard, but instead seals with the o-ring, which broadens the area of use to many applications. One of the advantages of using this solution is to prevent, for example, "heatsoak", place this screw in the desired place and then air easily by loosening the air screw. Specifications : Threaded bottom screw : AN10 Air Screw Thread: 1/8" O-Ring:  NBR Material:  AL6061-T6